A bottle cap structure having a breathable space is constructed comprising a bottle cap and a receptacle set in the bottle cap, the inner edge of the cap being provided with a first engaging portion at the center and a second And a second engaging portion for holding the receiving bottle in a spiral manner, and the second engaging portion for allowing the bottle cap to be screwed at the opening of the bottle container. And an inner circumference of the accommodating bottle is provided with a receiving space, and a third engaging portion is formed on one end outer circumferential surface and a plurality of air permeable holes communicating with the accommodating space are formed at a proper peripheral portion of the outer periphery of the bottle, The inner edge can be combined with a breathable space in a simple and stable structure for placing contents such as desiccant or cotton to enhance the use of the cap.一種具透氣空間之瓶蓋結構改良,其構成包含一瓶蓋及組設於該瓶蓋內之容置瓶,該瓶蓋內緣設有一位於中心處之第一結合部及一位於外圍的第二結合部,該第一結合部可供該容置瓶以螺旋方式固定,而該第二結合部則用於令該瓶蓋螺設於瓶罐容器之開口處。其次該容置瓶內緣設有一容置空間,一端外圓周面形成有第三結合部,並於其瓶身外緣周面適當處形成若干連通該容置空間之透氣孔,令該瓶蓋內緣能以簡便且穩固的結構結合一透氣空間,用以放置乾燥劑或棉花等內容物,增進瓶蓋的使用功能。(10)‧‧‧瓶蓋(11)‧‧‧第一結合部(12)‧‧‧第二結合部(20)‧‧‧容置瓶(22)‧‧‧第三結合部(23)‧‧‧透氣孔
